Great Falls (GTF) to Seattle (SEA): On-Time Performance
Data through May 2026
Great Falls (GTF) to Seattle (SEA) is a thinner route than most in this dataset — 117 departures over the past year, roughly 2 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 78% arrived on time.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.4%
- Flights/day
- 0.32
- last 12 months
- Duration
- 1h 57m
- scheduled
- Distance
- 512 mi
Monthly on-time trend
Best time to fly from GTF to SEA
Aim for departures around 2 p.m. (85% on-time); avoid 4 p.m. departures (73%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 69% | 13 min |
| Tuesdaybest | 86% | 8 min |
| Wednesday | 84% | 8 min |
| Thursday | 83% | 7 min |
| Friday | 77% | 17 min |
| Saturday | 73% | 15 min |
| Sunday | 71% | 18 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft51%
- Airline operations34%
- National airspace system10%
- Weather4%
Frequently asked questions
- How often are flights from GTF to SEA delayed?
- 22% of GTF–SEA flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 12 minutes.
- What is the best time of day to fly from GTF to SEA?
- Departures around 2 p.m. have the best record (85% on-time), while departures around 4 p.m. have the worst (73%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from GTF to SEA?
- The scheduled GTF–SEA flight time averages 1h 57m over 512 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are GTF to SEA flights cancelled?
- 0.4% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What day of the week is most reliable for GTF to SEA?
- Tuesday flights have the best record at 86% on-time. Day-of-week differences on this route are meaningful — Monday trails at 69%.
Explore related pages
More routes from GTF
Based on 240 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.